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116 lines
3.9 KiB
Java
116 lines
3.9 KiB
Java
/*
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* Copyright (c) 2000, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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package sun.jvm.hotspot.runtime;
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import java.io.*;
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import java.util.*;
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import sun.jvm.hotspot.debugger.*;
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import sun.jvm.hotspot.oops.*;
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import sun.jvm.hotspot.types.*;
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import sun.jvm.hotspot.utilities.Observable;
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import sun.jvm.hotspot.utilities.Observer;
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/** <P> ThreadLocalAllocBuffer: a descriptor for thread-local storage
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used by the threads for allocation. </P>
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<P> It is thread-private at any time, but maybe multiplexed over
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time across multiple threads. </P> */
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public class ThreadLocalAllocBuffer extends VMObject {
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private static AddressField startField;
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private static AddressField topField;
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private static AddressField endField;
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private static CIntegerField desired_sizeField;
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static {
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VM.registerVMInitializedObserver(new Observer() {
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public void update(Observable o, Object data) {
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initialize(VM.getVM().getTypeDataBase());
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}
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});
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}
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private static synchronized void initialize(TypeDataBase db) {
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Type type = db.lookupType("ThreadLocalAllocBuffer");
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startField = type.getAddressField("_start");
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topField = type.getAddressField("_top");
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endField = type.getAddressField("_end");
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desired_sizeField = type.getCIntegerField("_desired_size");
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}
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public ThreadLocalAllocBuffer(Address addr) {
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super(addr);
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}
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public Address start() { return startField.getValue(addr); }
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public Address end() { return endField.getValue(addr); }
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public Address top() { return topField.getValue(addr); }
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public Address hardEnd() { return end().addOffsetTo(alignmentReserve()); }
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private long alignmentReserve() {
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return Oop.alignObjectSize(endReserve());
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}
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private long endReserve() {
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long labAlignmentReserve = VM.getVM().getLabAlignmentReserve();
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long heapWordSize = VM.getVM().getHeapWordSize();
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return labAlignmentReserve * heapWordSize;
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}
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/** Support for iteration over heap -- not sure how this will
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interact with GC in reflective system, but necessary for the
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debugging mechanism */
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public OopHandle startAsOopHandle() {
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return startField.getOopHandle(addr);
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}
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/** Support for iteration over heap -- not sure how this will
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interact with GC in reflective system, but necessary for the
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debugging mechanism */
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public OopHandle nextOopHandle(OopHandle handle, long size) {
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return handle.addOffsetToAsOopHandle(size);
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}
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// public int size(); // FIXME: must adjust this to be in bytes
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// public int availableSize(); // FIXME: must adjust this to be in bytes
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public void print() {
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printOn(System.out);
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}
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public boolean contains(Address p) {
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if (top() == null) {
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return false;
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}
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return (start().lessThanOrEqual(p) && top().greaterThan(p));
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}
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public void printOn(PrintStream tty) {
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tty.println(" [" + start() + "," +
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top() + "," + end() + ",{" + hardEnd() + "})");
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}
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}
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